Battery piece and photovoltaic module

Abstract

The utility model discloses a battery piece and a photovoltaic assembly with the same, and the battery piece comprises a piece body and a grid line structure. The sheet body has a front surface and a back surface; the grid line structure is arranged on at least one of the front face and the back face and comprises a frame line, a first thin grid line and a second thin grid line, at least part of line segments of the frame line are edge line segments extending along the edge of the sheet body, the frame line is spaced from the edge of the sheet body, the first thin grid line is located in the frame line, and the second thin grid line is located outside the frame line. The first fine grid lines and the second fine grid lines are connected, and the joints are located on the edge line segments. According to the battery piece provided by the embodiment of the invention, the photoelectric conversion efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a solar cell and a photovoltaic module. Background Art

[0002] Currently, the front and back patterns of solar cells mostly consist of a four-sided border with a fine grid inside. A blank area often remains between the border and the edge of the cell. However, when these blank areas are illuminated by light, they also generate photocurrent. This current is primarily absorbed by the grid lines of the four-sided border. However, the absorption effect decreases significantly with distance from the border. To improve absorption, the distance between the four-sided border and the cell edge can theoretically be shortened. However, this introduces new problems. When printing the front silver paste and back aluminum paste, shortening the distance can easily cause the paste to smear on the edge of the cell, resulting in a short circuit between the front and back of the cell. This short circuit significantly increases leakage current, affecting the performance of the solar cell.

[0003] Therefore, there is room for improvement in solar cells. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a solar cell that improves photoelectric conversion efficiency while minimizing leakage and short circuit.

[0005] Another aspect of the present invention provides a photovoltaic module.

[0006] According to the battery cell of the embodiment of the first aspect of the present invention, the battery cell includes a cell body and a grid line structure. The cell body has a front side and a back side; the grid line structure is provided on at least one of the front side and the back side, and the grid line structure includes: a frame line, a first fine grid line, and a second fine grid line. At least part of the line segments of the frame line are edge line segments extending along the edge of the cell body, the frame line is spaced from the edge of the cell body, the first fine grid line is located within the frame line, the second fine grid line is located outside the frame line, and the first fine grid line and the second fine grid line are connected, and the connection point is located on the edge line segment.

[0007] According to the solar cell of the embodiment of the first aspect of the present invention, by setting the border line, it is ensured that the photoelectric current generated in the edge area of the solar cell body is effectively collected. Moreover, by setting the border line at the edge of the sheet body and maintaining an appropriate distance from the edge, the risk of short circuit is avoided and the reliability of current collection is ensured. By setting the first fine grid line inside the border line. The first fine grid line covers the main active area of the sheet body and can collect the photoelectric current generated in this area. By setting the second fine grid line outside the border line. Not only is the current collection rate of the area outside the border line expanded, but the current output capacity of the entire solar cell is also improved. The connection between the first fine grid line and the second fine grid line is set on the edge line segment, which is conducive to reducing the probability of wire breakage at the connection between the second fine grid line and the border line.

[0008] According to some embodiments of the present invention, in the battery cell, the distance between the edge line segment and the edge of the cell body is 0.5-2.3 mm.

[0009] According to some embodiments of the solar cell of the present invention, the distance between the free end of the second fine grid line and the edge of the cell body is greater than or equal to 0 and less than or equal to 0.7 mm.

[0010] According to some embodiments of the present invention, in the solar cell, the distance between the free end of the second fine grid line and the edge line segment is greater than 0 and less than or equal to 0.8 mm.

[0011] According to some embodiments of the battery cell of the present invention, the edge line segment extends along the first direction, the border line includes two edge line segments arranged at intervals along the second direction, and the first direction intersects with the second direction; there are multiple first fine grid lines and they are arranged at intervals along the first direction, each of the first fine grid lines extends along the second direction, and each of the first fine grid lines is connected to at least one edge line segment; the two edge line segments are connected to the second fine grid line on one side away from each other, and there are multiple second fine grid lines and they are arranged at intervals along the first direction.

[0012] In some embodiments, there are at least two gate line structures, and the gate line structures are arranged at intervals along the first direction.

[0013] In some embodiments, the gate line structure further includes a plurality of third fine gate lines arranged along the second direction and extending along the first direction, and located between two adjacent first fine gate lines, with both ends of the third fine gate lines along the first direction connected to the first fine gate lines.

[0014] In some embodiments, a chamfer is provided at a corner of the sheet; at least one end of the edge line segment is located at the chamfer to form a fold line segment, and the second fine grid line is connected to the fold line segment.

[0015] According to some embodiments of the solar cell of the present invention, the grid line structure is provided on both the front and back sides of the cell body, and the second fine grid lines are provided on both sides in a one-to-one correspondence.

[0016] The photovoltaic module according to the second embodiment of the present invention includes a solar cell, which is the solar cell in the first embodiment of the present application.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 Shows a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0020] Figure 2 A partial structural schematic diagram of the front side of a battery cell provided in some embodiments of the present application is shown;

[0021] Figure 3 A partial structural schematic diagram of the back side of a battery cell provided in some embodiments of the present application is shown;

[0022] Figure 4 Shows this application Figure 2 Enlarged view of point A in the middle;

[0023] Figure 5 A comparison table of the electrical performance of some battery cells in the prior art and the battery cells of the embodiments of the present application is shown;

[0024] Figure 6 The leakage distribution data table of some battery cells in the prior art and the battery cells of the embodiments of the present application is shown.

[0025] Reference numerals:

[0026] Battery cell 100,

[0027] Sheet 1, front 11, back 12, chamfer 13,

[0028] Gate line structure 2, border line 20, edge line segment 201, fold line segment 202,

[0029] A first thin gate line 21 , a second thin gate line 22 , and a third thin gate line 23 . DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "front" and "rear" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] It's worth noting that in a solar cell, a grid structure is laid out on the cell. The cell absorbs light energy and excites electrons and holes, generating an electric current. The grid structure is a conductive path that guides the current output. Therefore, the cell and the grid structure work together to convert light energy into electrical energy.

[0034] The present application improves the photoelectric conversion efficiency of a solar cell by improving the grid line structure.

[0035] Reference below Figure 1 - Figure 4 The cell 100 according to an embodiment of the present invention is described. The application field of the present invention is not limited, for example, it can be applied to PERC cells, HIT heterojunction cells, TOPCON cells, etc.

[0036] Figure 1 1 shows a schematic structural diagram of a battery cell 100 provided in some embodiments of the present application. The battery cell 100 includes a cell body 1 and a grid line structure 2 .

[0037] The sheet 1 has a front surface 11 and a back surface 12 . The gate line structure 2 is provided on at least one of the front surface 11 and the back surface 12 .

[0038] When the grid line structure 2 is provided on the front surface 11 of the sheet 1, as shown in FIG. Figure 2 As shown, the gate line structure 2 is usually covered in the form of fine lines on the surface of the wafer 1. These gate line structures 2 are responsible for collecting the photocurrent on the front surface 11 of the wafer 1, and also form a good electrical connection with the wafer 1 through contact to ensure that the current can be smoothly discharged.

[0039] When the gate line structure 2 is provided on the back surface 12 of the sheet 1, as shown in FIG. Figure 3 As shown, the main function of the gate line structure 2 is to collect the photocurrent on the back side 12 of the cell 1 and conduct it to the external circuit of the cell 100 .

[0040] Therefore, the arrangement of the grid line structure 2 of the present application on the front side 11 and the back side 12 can be adjusted according to the user's specific application requirements and battery design. In some embodiments, the grid line structure 2 of the present application can be set only on one side of the sheet 1, and the other side of the sheet 1 can be set with a conventional grid line structure disclosed in the art. In other embodiments, the grid line structure 2 of the present application can be set on both the front side 11 and the back side 12 of the sheet 1 to achieve more efficient current collection and transmission.

[0041] like Figure 2 - Figure 3 As shown, the gate line structure 2 includes a frame line 20, a first thin gate line 21 and a second thin gate line 22. The three work together to realize current collection and transmission.

[0042] The border line 20 is spaced apart from the edge of the cell body 1. By setting the spacing, the short circuit problem caused by the border line 20 on one side of the cell 100 and the border line on the other side forming a line contact can be effectively reduced. The setting of the border line 20 on this side of the cell 100 ensures that the border line 20 can collect the photocurrent generated by the edge area. Figure 3 As shown, at least part of the line segments of the border line 20 are edge line segments 201 extending along the edge of the sheet 1 .

[0043] like Figure 2 - Figure 3 As shown, the first fine grid lines 21 are located within the frame lines 20. They are distributed in the form of fine lines on the surface of the wafer 1 and are mainly responsible for collecting the photocurrent generated inside the wafer 1. The first fine grid lines 21 can effectively cover the active area within the frame to ensure current collection efficiency.

[0044] like Figure 2 - Figure 3As shown, the second fine grid lines 22 are located outside the frame lines 20 and are connected to the first fine grid lines 21 at the connection points along the edge line segments 201. The second fine grid lines 22 are equivalent to the extensions of the first fine grid lines 21 extending outside the frame lines 20, allowing the second fine grid lines 22 to collect current outside the frame lines 20 and then transmit it to the first fine grid lines 21. This can, to a certain extent, expand the current collection range around the frame lines 20 and improve the current output of the entire cell 100.

[0045] like Figure 2 - Figure 4 As shown, the cell 100 of the present application can stably improve the conversion efficiency of the cell 100 by providing the second fine grid lines 22. Compared with a conventional cell without the second fine grid lines 22, the cell 100 of the present application has a slight improvement in conversion efficiency, with the efficiency improvement reaching 0.01% to 0.05%.

[0046] like Figure 5 The table shows a comparison of the electrical performance of a cell 100 with a second grid line 22 and a conventional cell with the same structure but without the second grid line 22 in some embodiments of the present application. It is clear from the comparison table that when the first grid line 21 on the cell 100 is extended outside the frame line 20 to form the second grid line 22, the efficiency (Eta) of the cell 100 is improved to a certain extent, as shown in FIG. Figure 5 After the second fine grid lines 22 are installed, the efficiency of the cell 100 is increased by 0.015%. The short-circuit current (Isc), fill factor (FF), and reverse current (IRev2) of the cell 100 with the second fine grid lines 22 are significantly improved. Therefore, the economic benefits and competitiveness of the cell 100 with the second fine grid lines 22 in this application are significantly improved in practical applications.

[0047] In addition to the above advantages, the battery cell 100 in the present application is also conducive to improving the leakage risks existing in traditional battery cells. In the design of traditional battery cells, the leakage problem of the battery cell often comes from the line contact between the border lines on the front and back sides. This contact method makes the leakage risk relatively high. However, in the present application, after the first fine grid line 21 is extended outside the border line 20 to form the second fine grid line 22, the second fine grid line 22 is used to absorb the photocurrent in the blank area at the edge of the sheet 1. There is no need to bring the border line 20 too close to the edge of the sheet 1. In this way, the border line 20 on the front and back of the battery cell 100 is not easy to produce line contact, thereby avoiding the short circuit and leakage problems caused by line contact. After the second fine grid line 22 is set, even if the second fine grid line 22 contacts the fine grid line or the border line 20 on the other side of the sheet 1, it is only point contact, and the short circuit and leakage risks caused by point contact are much lower than the risks caused by line contact. Therefore, the present application solution helps to improve the safety and stability of the battery cell 100.

[0048] It's known that in some existing solar cell gridline structures, the distance between the frame and the edge of the cell ranges from 0.5mm to 1.5mm. If the distance between the edge segments and the cell edge is further shortened, the frame lines will be too close to the cell edge, increasing the risk of short circuits and, in turn, affecting cell performance and safety. Furthermore, the smaller spacing requires greater precision during the manufacturing process to control the positional relationship between the gridline structure and the cell edge. This can also increase production difficulty and cost, and reduce efficiency.

[0049] Therefore, the above problem can be solved by appropriately increasing the distance between the frame line 20 and the edge of the sheet 1 .

[0050] In the present application, the first fine grid line 21 and the second fine grid line 22 are connected, and the connection point is located on the edge line segment 201. This is a scheme of connecting the first fine grid line 21 and the second fine grid line 22 in the processing method of the grid line structure known in the basic prior art, and the processing quality is higher. Taking the processing of the grid line structure by printing as an example, the grid line structure is printed on the surface of the sheet 1 by conductive paste. Affected by the molecular tension of the paste, the grid line is easy to break when it is too thin. In the present application, the connection point of the first fine grid line 21 and the second fine grid line 22 is placed on the edge line segment 201, and the attraction effect of the molecules on the first fine grid line 21 on the molecules on the second fine grid line 22 is utilized, so that the connection between the second fine grid line 22 and the edge line segment 201 is not easy to break, thereby ensuring the absorption of the current in the edge area of the sheet 1.

[0051] In such Figure 4 In some of the embodiments shown, the distance between the edge segment 201 and the edge of the sheet 1 is D, satisfying 0.5≤D≤2.3mm. By appropriately increasing the distance D between the border line 20 and the edge of the sheet 1, it can be ensured that the current collection efficiency is not significantly affected, and the risk of short circuit can be effectively reduced, and the manufacturing difficulty can be reduced. It is worth mentioning that this is precisely because the grid line structure 2 in the battery cell 100 of the present application is provided with a second fine grid line 22 on the outside of the border line 20. The second fine grid line 22 forms a complete current collection network by connecting with the border line 20 and the first fine grid line 21. In this way, even if the distance between the border line 20 and the edge of the sheet 1 increases, it will not have a significant impact on the current collection.

[0052] In some embodiments, the distance between the free end of the second fine grid line 22 and the edge of the sheet 1 is D1, satisfying 0≤D1≤0.7mm. For example, D1 may be 0.7mm, 0.6mm, 0.5mm, 0.4mm, 0.3mm, etc. Here, the distance D1 between the free end of the second fine grid line 22 and the edge of the sheet 1 is controlled to be above 0. This arrangement ensures that one end of the second fine grid line 22 can extend as far as possible toward the edge of the sheet 1, thereby expanding the current collection range to the greatest extent. At the same time, by maintaining a certain distance from the edge of the sheet 1, the risk of short circuit caused by direct contact between the second fine grid line 22 and the edge of the sheet 1 is effectively avoided.

[0053] According to some embodiments of the present invention, the distance D2 between the free end of the second thin grid line 22 and the edge line segment 201 satisfies 0≤D2≤0.8. For example, D2 can be 0.8mm, 0.7mm, 0.6mm, 0.5mm, 0.4mm, 0.3mm, etc.

[0054] When D2 is within this range, the second thin grid lines 22 can fully extend to cover a wider area near the edge of the cell 1, thereby improving the current collection efficiency. Whether 0.8mm, 0.7mm, or even smaller values such as 0.6mm or 0.5mm are selected, the current collection range can be increased to a certain extent, improving the overall performance of the cell 100.

[0055] like Figure 6 Shown is a comparison table of leakage distribution data of a battery cell 100 with a second fine grid line 22 and an ordinary battery cell with the same structure but without the second fine grid line 22 in some embodiments of the present application. It can be clearly seen from this comparison table that under normal standards for ordinary battery cells, the leakage rate (>0.5A) is 0.1%, and under normal standards for the battery cell 100 with the second fine grid line 22 in the present application, the leakage rate (>0.5A) is 0.05%. It is worth noting that leakage above 0.5A is mainly strongly related to the hygiene of the production line process. Therefore, the leakage impact brought by the battery cell 100 in the present application is smaller.

[0056] Under the tightened standard, the leakage rate of ordinary battery cells (>0.2A) is 0.66%. Under the normal standard, the leakage rate of the battery cell 100 after the second fine grid line 22 of the present application is 0.74%. The leakage rate of the battery cell 100 of the present application under the normal standard is not significantly higher than the leakage rate of ordinary battery cells under the tightened standard. It can be seen that the degree of influence of the battery cell 100 of the present application on leakage is controllable, and it will not affect the leakage rate of the production line under normal standards.

[0057] In addition, by improving the layout and size of the second thin grid lines 22 outside the frame line 20, the yield of the battery cell 100 can be controlled.

[0058] like Figure 1 As shown, according to some embodiments of the present invention, the battery cell 100 has an edge segment 201 extending along a first direction, and the border line 20 includes two edge segments 201 spaced apart along a second direction, and the first direction intersects the second direction.

[0059] The provision of edge line segments 201 facilitates the formation of a coherent and efficient current collection path along the edge of the sheet 1. Furthermore, the border line 20 comprises two edge line segments 201 spaced apart along the second direction. Here, the first and second directions intersect, facilitating current collection in different directions and thereby enhancing the comprehensiveness of current collection.

[0060] There are multiple first fine grid lines 21 that are spaced apart along the first direction to ensure uniform collection and transmission of current within the sheet 1. This application does not limit the number of first fine grid lines 21, and the number of first fine grid lines 21 can be adjusted according to actual conditions.

[0061] Each first thin gate line 21 extends along the second direction, which is perpendicular to the extension direction of the edge line segment 201, thereby forming a crisscrossing gate line network. This network structure directly increases the current collection path.

[0062] Each first gridline 21 is connected to at least one edge segment 201. This connection not only ensures that the current from the border line 20 can be smoothly drained, but also ensures that the current collected by the two gridlines is transmitted to the first gridlines 21 through the edge segments 201. Through the connection between the first gridlines 21 and the edge segments 201, the current collection network of the solar cell 100 is closed, achieving complete current collection.

[0063] like Figure 1 As shown, two edge line segments 201 spaced apart along the second direction are connected to a second fine grid line 22 on one side away from each other. There are multiple second fine grid lines 22 spaced apart along the first direction.

[0064] The second fine grid lines 22 are not arranged singly, but are arranged on two opposite outer sides of the frame, and these second fine grid lines 22 are arranged at intervals along the first direction. This arrangement ensures that the current outside the frame is evenly collected and transmitted.

[0065] At the same time, the above arrangement makes the appearance of the entire battery cell 100 more regular.

[0066] The present application does not limit the number of the second fine gate lines 22 , and the number of the second fine gate lines 22 can be adjusted according to actual conditions.

[0067] like Figure 1 As shown, in some embodiments, there are at least two gate line structures 2 , which are arranged at intervals along the first direction.

[0068] First, by increasing the number of gate structures 2, the cell 100 can be divided into more independent current collection areas. The gate structures 2 within each area can independently collect and extract the photocurrent generated in that area, further improving the comprehensiveness of current collection. This segmented electrode configuration also helps reduce current loss during transmission and improve energy conversion efficiency.

[0069] Secondly, the gridline structures 2 arranged at intervals along the first direction can ensure uniform current distribution within the cell 100. By properly adjusting the distance between the gridline structures 2, effective control of current density can be achieved, avoiding excessive or sparse current in certain areas. This helps maintain the stability and consistency of the overall performance of the cell 100.

[0070] Furthermore, the presence of multiple gridline structures 2 enhances the reliability of the solar cell 100. Because each gridline structure 2 is relatively independent, even if one gridline structure 2 fails or is damaged, the other gridline structures 2 can continue to function normally. This reduces the risk of failure of the entire solar cell 100 due to a single point of failure, thereby improving the durability and reliability of the solar cell 100.

[0071] According to some embodiments of the present invention, the battery cell 100 is as follows: Figure 2 - Figure 3 As shown, the gate line structure 2 further includes a plurality of third fine gate lines 23. The third fine gate lines 23 are arranged along the second direction and extend along the first direction, and are located between two adjacent first fine gate lines 21. The third fine gate lines 23 are connected to the first fine gate lines 21 at both ends along the first direction. Specifically, the third fine gate lines 23 are located between two adjacent first fine gate lines 21, and their two ends are respectively connected to the two adjacent first fine gate lines 21.

[0072] The third gate line 23 plays a key role in preventing the first gate line 21 from breaking. In practical applications, due to factors such as material defects, manufacturing processes, or external environmental factors, the first gate line 21 may sometimes break, resulting in a problem with the smooth transmission of current. However, due to the presence of the third gate line 23, even if a first gate line 21 breaks, the current can continue to be transmitted through the third gate line 23 to other first gate lines 21 adjacent to the broken first gate line 21, thereby ensuring the continuity and stability of current transmission.

[0073] Such an arrangement not only improves the current collection efficiency of the battery cell 100 , but also enhances its reliability and durability in practical applications.

[0074] According to some embodiments of the present invention, the battery cell 100 is as follows: Figure 1 As shown, the corners of the cell 1 are chamfered 13. The purpose of providing chamfers 13 on the corners of the cell 1 is to eliminate sharp edges and corners. This reduces stress concentration and misalignment, effectively minimizing the risk of mechanical damage and cracking during manufacturing, transportation, and installation, thereby improving the overall reliability and durability of the cell 100.

[0075] like Figure 1 As shown, at least one end of the edge segment 201 is located at the chamfer 13 to form a folded line segment 202. The folded line segment 202 presents a change in angle, so that the grid line structure 2 can adapt to the shape of the sheet 1 more flexibly.

[0076] like Figure 2 - Figure 3 As shown, the second thin grid lines 22 are connected to the fold line segments 202. This allows the current at the corners of the sheet 1 to be smoothly transmitted along the second thin grid lines 22 to the edge segments 201, further widening the current collection range in the sheet 1.

[0077] According to some embodiments of the battery cell 100 of the present invention, both the front side 11 and the back side 12 of the cell body 1 are provided with a grid line structure 2 , and the second fine grid lines 22 on both sides are arranged in a one-to-one correspondence or staggered arrangement.

[0078] The second fine grid lines 22 on the front surface 11 and back surface 12 are positioned in the same corresponding positions. This arrangement improves the efficiency of printing the grid line structure 2. Because the grid lines on both sides of the sheet 1 are positioned in the same manner, complex alignment and adjustment are not required during the printing process, thereby simplifying the production process and reducing production costs.

[0079] The second thin grid lines 22 on the front surface 11 and back surface 12 are staggered. This arrangement prevents the grid line structures 2 on the front and back surfaces 12 from contacting each other at the edge of the cell 1, thereby effectively preventing short circuits and correspondingly improving the stability of the cell 100.

[0080] The photovoltaic module according to the embodiment of the second aspect of the present invention includes a cell 100. The cell 100 is the cell 100 of the embodiment of the first aspect of the present application.

[0081] This photovoltaic module has higher photoelectric conversion efficiency and more stable performance.

[0082] Below, refer to the attached Figure 1 - Figure 4, describing a battery cell 100 according to a specific embodiment of the present application.

[0083] Reference Figure 1 The battery cell 100 includes a cell body 1 and a grid line structure 2 .

[0084] Reference Figure 2 - Figure 3 The sheet body 1 includes a front surface 11 , a back surface 12 and a chamfer 13 .

[0085] The gate line structures 2 are located on the front surface 11 and the back surface 12. There are two gate line structures 2 on each surface, and they are arranged at intervals along the first direction.

[0086] The gate line structure 2 includes a frame line 20 , a first thin gate line 21 , a second thin gate line 22 and a third thin gate line 23 .

[0087] The frame line 20 is spaced apart from the edge of the sheet 1 .

[0088] Reference Figure 4 The border line 20 includes a line segment 201 extending along the edge of the sheet 1. The distance between the line segment 201 and the edge of the sheet 1 is D. One end of the line segment 201 forms a fold line segment 202 at the chamfer 13, and the second fine grid line 22 is connected to the fold line segment 202.

[0089] The first thin gate lines 21 are located inside the frame line 20 , and the second thin gate lines 22 are located outside the frame line 20 . The first thin gate lines 21 and the second thin gate lines 22 are connected, and the connection point is located on the edge line segment 201 .

[0090] The distance between the free end of the second fine grid line 22 and the edge of the sheet 1 is D1.

[0091] The distance between the free end of the second fine gate line 22 and the edge segment 201 is D2.

[0092] Reference Figure 2 The third thin gate lines 23 are arranged along the second direction and extend along the first direction and are located between two adjacent first thin gate lines 21 . Both ends of the third thin gate lines 23 along the first direction are connected to the first thin gate lines 21 .

[0093] Other components of the cell according to the embodiment of the present invention, such as photovoltaic components, are well known to those skilled in the art and will not be described in detail here.

[0094] Throughout this specification, references to terms such as "embodiment" and "example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0095] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: a sheet having a front side and a back side; A gate line structure, wherein the gate line structure is arranged on at least one of the front and the back sides, and the gate line structure includes: a frame line, a first fine gate line and a second fine gate line, at least part of the line segments of the frame line are edge line segments extending along the edge of the sheet body, the frame line is spaced from the edge of the sheet body, the first fine gate line is located inside the frame line, the second fine gate line is located outside the frame line, the first fine gate line and the second fine gate line are connected, and the connection point is located on the edge line segment.

2. The battery cell according to claim 1, wherein: The distance between the edge line segment and the edge of the sheet body is 0.5-2.3 mm.

3. The battery cell according to claim 1, wherein: A distance between the free end of the second thin grid line and the edge of the sheet is greater than or equal to 0 and less than or equal to 0.7 mm.

4. The battery cell according to claim 1, wherein: The distance between the free end of the second thin grid line and the edge line segment is greater than 0 and less than or equal to 0.8 mm.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The edge line segment extends along a first direction, the border line includes two edge line segments spaced apart along a second direction, and the first direction intersects the second direction; There are a plurality of first fine grid lines and the first fine grid lines are arranged at intervals along the first direction, each of the first fine grid lines extends along the second direction, and each of the first fine grid lines is connected to at least one of the edge line segments; The sides of the two edge line segments away from each other are both connected with the second fine grid lines, and there are a plurality of the second fine grid lines arranged at intervals along the first direction.

6. The battery cell according to claim 5, characterized in that: There are at least two gate line structures, which are arranged at intervals along the first direction.

7. The battery cell according to claim 5, characterized in that: The gate line structure further includes: A plurality of third fine gate lines are arranged along the second direction and extend along the first direction and are located between two adjacent first fine gate lines. Both ends of the third fine gate lines along the first direction are connected to the first fine gate lines.

8. The battery cell according to any one of claims 1 to 4, characterized in that: The edges and corners of the sheet are chamfered; At least one end of the edge line segment is located at the chamfer to form a fold line segment, and the second fine grid line is connected to the fold line segment.

9. The battery cell according to any one of claims 1 to 4, characterized in that: The grid line structure is provided on both the front and back sides of the sheet body, and the second fine grid lines are arranged on both sides in a one-to-one correspondence.

10. A photovoltaic module, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 9.

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